Electric heater.



A. S. GUBITT.

ELECTRIC HEATER.

APPLIOATION. FILED 2213.16, 1910.

Patented July 19,l 1910.

INYENTE. ELHIELD .5'. DUBITJZ'. HMO@ m TIURNE'?.

WITNESSES; mk m UNITED STATES IJATENT OFFICEe` ARCHIBALD S. CUBI'IT,` UE PITTSFIELD, MASSACHUSETTS, ASSIGNOR T0 GENERAL ELECTRIC COMPANY, A CORPORATIOLI 0F NEW YORK.

ELECTRIC HEATER.

Specification of Letters Patent.

Patented Ju1y19, 1910.

Application filed February 16, 1910. Serial No. 54%,150.

To all whomt't may concern:

Be it known that I, ARCHIBALD S. CUBrrT, a subject of the King of Great Britain, residi-ng at Pittsfield, county of Berkshire, State of Massachusetts, have invented ceri tain new and useful Improvements in Electric Heaters, of which the following is a specification. O

This invention relates to electric heaters and the like and has for its object the provision of a device of this character in which the heating element is so arranged that the device may be constructed in a simple and inexpensive manner and at the same time be thoroughly etlicient and durable.

My invention relates more specifically to means for supporting the heating clement of electric heaters.

In carrying out my invention I employ, instead of the single coil which is commonly used, a plurality of coils arranged in multiple. rIhe coils are supported at their ends in the usual fashion. In order to support the coils at intermediate points in an inexpensive way, I provide non-insulating supports which engage the -coils at equi-potential points. These supports are in the form of strips which engage the various coils so as to support them and are themselves supported at their ends. 'Ihis'arrangement facilitates the nnnufacture and assembling of the heating coils and eliminates a large portion of the insulation which has heretofore been employed. l l l Other objects of my invention will appear in the course of the following specification, in which-I have shown my invention embodied in concreteform for purposes of illustration.

Referring tto the drawing, Figure 1 represents a plan view of 'an electric heater embodying my invention, the top being broken away to show the arrangement of the coils;

lto

Fig. 2 epresents a side view 'of the same likewise parti-ally broken away; 'and Figf represents an end view with a portion of the casing removed to show the structure.

Referring to the drawing, 10 represents a frame of an electric heater which may be an electric stove, -or the like. Mounted within this frame, which is rectangular in shape, are' a plurality' ofV heating sections. In this case I have shown two sections, 11 and '12, arranged in series. These two sections areidentical and a description of one of them is therefore sutlicient. Each section comprises a plurality of parallel coils 13, each having one end connected to a common .metallicl bar 14, while'the opposite ends are connected to a longer metallic bar 15, which is common to the coils of both sections. These coils being electrically connected at their opposite ends by metallic bars are arranged to operate in multiple. These coils are formed of high resistance conductors These members are of metal and are directly In order to avoid any lack of uniformity in the heat, or any .in contact with the coils.

undue heating in any section of the coils, I arrange to have these transverse members engage the coils at points of equalpotential. The coils all'being of the same diameter and the wires of uniform cross section, the point of equi-potential will be found at equal distances from the points of support. In other words, there will be the same number of turns of the wire'in each coil vbetween the various transverse members. These transverse members are fastened at one end in supports 17 arranged along the side of the frame and have their other ends in supports 18 arranged along the center of the frame. The supports themselves are held in place by being secured to the metallic plate 19 which forms the top of the 'frame 10. The support-s 17 are secured to the plates by riveting, whereas the supports 18, which are common tothe transverse members of both sections 11 and 12, are secured by means of a bolt and nut. The transverse strips 16 are insulated from the supports by insulating bushings 20. These transverse plates are likewise provided with curved depressions 21 for receiving the coils as' shown in- Fig. 3. The coils are simply slipped onto the supports so that the latter pass between the turns. The terminals 22 are provided, one for each section of resistance, so that the current passes` from one of the terminals through the coils on one side in multiple in one direction and thence back through the' coils on the other side and out through the other terminal. The frame 10, with its coils,

bodied in specific structure for purposes of illustration in accordance with the, patent statutes, it should be understood that I do notlimit my invention thereto, since various modilications thereofv Will suggest theml selves to those skilled in the art without departing from thespirit of my invention, the scope ot' which is set forth in the annexed claims. 4

Vhat- I claim as new and desire to secure by Letters Patent of the United States, is,

1Q An electric heater comprising agplurality of coilslsupported at their ends and connected lto Voperate in multiple, and an intermediate support common to the coils and electrically connecting the same at equi-potential points.

2. An electric heater comprising a plurality of coils supported at their ends and connected to operate in multiple, and a plurality of intermediate 'supports common to the coils and electrically connectingA the same at equi-potential points.- y

3. An electric heater comprising a plurality of parallel coils supported at their ends and connected to operate in multiple, and an intermediate support common to the coils and .electrically connecting the same at equi-potential points.

4. An electric heater comprising a plurality of coils supported at their ends and connected to operate in multiple, and a transverse metallic member engaging the coils at equi-potential points to support the same.

5. An electric heater comprising a plurality of parallel coils. supported at their ends and connected to` operate in multiple, and transverse parallel metallic members engaging the coils at equi-potential points to support the Same. 6. An electric heater consisting of resistance sections connected in series, each section comprising a plurality of coils supported at their ends and connected to operate in multiple, and an intermediate support common to the coils and electrically connecting the same at equi-potential points.

7. An electric heater consisting of resistance sections connected in series, each section comprising a plurality of coils supported at their ends and connected to operate in multiple, and transverse metallic members engaging the coils at equi-potential points to support the same.

In witness whereof, I have hereunto set my hand this 10th day of Feb., 1910.

ARCHIBALD S. CUBITT.

Witnesses z JOHN C. MUseaovE, WILLIAM MAYNARD. 

